Date: Wed, 14 Sep 2016 13:01:57 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-xen@FreeBSD.org Subject: [Bug 212681] I/O is slow for FreeBSD DOMu on XenServer Message-ID: <bug-212681-23905-jgxd96oDjg@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-212681-23905@https.bugs.freebsd.org/bugzilla/> References: <bug-212681-23905@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212681 karl@pielorz.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |karl@pielorz.com --- Comment #1 from karl@pielorz.com --- Hi, We run XenServer 6.5 and 7 here - with a range of FreeBSD versions (mostly = 10.x now). We've not noticed any really low I/O performance. How are you running dc3dd? - So I can try and install / replicate this here. We have seen that I/O behaves differently under XenServer than it does on b= are metal (which is obvious - i.e. local SATA SSD vs. Multipath iSCSI [or simil= ar]) you will see differences (even just with 'mapped through XenServer' "Local Storage"). It could be dc3dd / the stuff you're running is a particularly 'bad case' f= or the I/O. e.g. In an equally 'synthetic' test - a regular "dd if=3D/dev/zero of=3Dtest.dat bs=3D64k count=3D10240" on our our test pool here (which has = two paths iSCSI over Gigabit) we get around 220Mbyte/sec to a FreeBSD DomU. That may well be a best case - and you may well have hit some worst cases. -Karl --=20 You are receiving this mail because: You are the assignee for the bug.=
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